SN74HC02NS NOR Gate IC Equivalent & Substitute Parts

Part Overview

The SN74HC02NS is a 4-channel 2-input NOR Gate logic IC manufactured by Texas Instruments in 14-SO surface mount packaging. This component is classified as discontinued at DiGi Electronics, making substitute parts necessary for ongoing production and maintenance applications. The SN74HC02NS serves as a fundamental building block in digital logic circuits requiring NOR gate functionality across multiple channels with CMOS technology characteristics.

Substiute Parts

SN74HC02NS

Texas InstrumentsIn Stock: 1343SN74HC02NS Datasheet

Current PartRFQ

SN74HC02NSR

Texas InstrumentsIn Stock: 3485SN74HC02NSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC02NS is determined by strict equivalence across the following critical parameters:

• Logic function: 4-channel NOR gate with 2 inputs per channel
• Supply voltage range: 2V ~ 6V
• Quiescent current specification: 2 µA maximum
• Output current capability: 5.2mA for both high and low states
• Propagation delay: 15ns at 6V with 50pF load
• Operating temperature range: -40°C ~ 85°C
• Physical package: 14-SOIC form factor
• Compliance certifications: ROHS3, MSL Level 1

The SN74HC02NSR qualifies as a direct substitute based on identical electrical specifications and package geometry. The primary distinction is packaging format: the original part uses Tube packaging while the substitute uses Tape & Reel (TR) format. Both maintain the same 14-SO supplier device package specification.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC02NSR is a direct functional and electrical equivalent to the SN74HC02NS. Selection between these parts should be based on the following criteria:

Product Status: The SN74HC02NSR maintains active product status with Texas Instruments, ensuring continued availability and supply chain reliability. The original SN74HC02NS is discontinued at DiGi Electronics, limiting procurement options.

Compliance & Certifications: Both parts maintain identical ROHS3 compliance and MSL Level 1 ratings, ensuring equivalent environmental and handling requirements.

Packaging Considerations: The SN74HC02NSR is supplied in Tape & Reel format, which is standard for automated assembly processes and high-volume production. The original Tube packaging is suitable for manual assembly or lower-volume applications. Both use the identical 14-SOIC physical package, ensuring PCB footprint compatibility.

Electrical Equivalence: All electrical parameters, including supply voltage range, quiescent current, output current, propagation delay, and operating temperature range, are identical between the two parts.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC02NSR be used as a direct replacement for the SN74HC02NS on existing PCBs?

A: Yes. Both parts use the identical 14-SOIC package with matching pin assignments and electrical specifications. No circuit modifications are required.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging contains individual components in a plastic tube, suitable for manual handling and lower-volume assembly. Tape & Reel packaging places components on a continuous tape wound on a reel, optimized for automated pick-and-place assembly equipment. The electrical and functional performance is identical.

Q: Are there any input logic level differences between these parts?

A: The input logic level specifications differ slightly between the two parts. The SN74HC02NS specifies Input Logic Level - Low: 0.1V ~ 0.26V and High: 1.998V ~ 5.8V. The SN74HC02NSR specifies Input Logic Level - Low: 0.5V ~ 1.8V and High: 1.5V ~ 4.2V. Both specifications fall within the standard CMOS logic thresholds and are compatible with typical digital logic circuits operating within the 2V ~ 6V supply range.

Q: Why is the SN74HC02NS discontinued?

A: Component discontinuation is typically driven by market demand, manufacturing priorities, and supply chain optimization. The SN74HC02NSR remains in active production and serves the same functional requirements.

Q: What certifications apply to both parts?

A: Both the SN74HC02NS and SN74HC02NSR are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings, indicating no special moisture handling requirements during storage or assembly.